The Scoville Scale, Explained: A Visual Heat Ladder from Bell Pepper to Pepper X

The Scoville scale is the closest thing chili lovers have to a universal heat language. Created by pharmacist Wilbur Scoville in 1912, it measures the concentration of capsaicin — the compound responsible for chili heat — in Scoville Heat Units (SHU). Today it’s measured by high-performance liquid chromatography rather than human taste testers, but the unit stuck.

How to read SHU numbers

Each step is roughly an order of magnitude. A jalapeño at 5,000 SHU isn’t “a little hotter” than a poblano at 1,500 SHU — it’s about three times as hot. A habanero at 200,000 SHU is forty times hotter than a jalapeño.

The heat ladder

• 0 SHU — Bell pepper. No capsaicin.
• 500–2,500 SHU — Poblano, Anaheim. Background warmth.
• 2,500–8,000 SHU — Jalapeño. The defining “medium” heat.
• 10,000–23,000 SHU — Serrano.
• 30,000–50,000 SHU — Cayenne, Thai bird.
• 100,000–350,000 SHU — Habanero, Scotch bonnet.
• ~1,000,000 SHU — Ghost pepper.
• ~1,600,000 SHU — Carolina Reaper.
• ~2,690,000 SHU — Pepper X. Current record holder.

Why your tongue disagrees with the scale

SHU measures capsaicin concentration, not perceived heat in a finished dish. Fat, acid, sweetness, and how you prepped the pepper all shift the experience.

A practical kitchen reference

Crushed red pepper flakes (35,000–50,000 SHU) are the most useful shelf reference. Check chili flake options on Amazon.

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